Objective: To evaluate the immunoisola ti ng effects of barium-alginate microencapsulation on islets allograft survival. Methods: The nonmicroencapsulated and microencapsulated islets w ere transplanted under the kid...Objective: To evaluate the immunoisola ti ng effects of barium-alginate microencapsulation on islets allograft survival. Methods: The nonmicroencapsulated and microencapsulated islets w ere transplanted under the kidney capsule or intraperitoneally into Wistar rat w ith STZ-induced diabetes. The blood glucose and insulin secretion of grafts wer e observed. Graft function was tested by oral glucose tolerance test (OGTT). Results: ①Five diabetic rats became normoglycemic for 48 to 72 h after microencapsulated islets transplantation. The survival of transplanted i slets was on an average of 6 W. ②The normalization of the glycemia and insulin in the transplanted rats was associated with normal glucose and insulin profiles in response to OGTT. Conclusion: Microencapsulation with barium -alginate membrane can prolong islet survival and protect islets against allore jection.展开更多
BACKGROUND: The most common complication after allogenic islet transplantation is rejection. This study was to evaluate the effect of anti-rejection of glucocorticoid-free immunosuppressive regimen on allogenic islet ...BACKGROUND: The most common complication after allogenic islet transplantation is rejection. This study was to evaluate the effect of anti-rejection of glucocorticoid-free immunosuppressive regimen on allogenic islet transplantation. METHODS: Tacrolimus(FK506)+mycophenolate mofetil (MMF) and FK506+MMF+prednisone (Pred) were administered respectively for 2 weeks to inhibit rejection after allogenic islet transplantation in rats, which were compared with the control group. The concentrations of blood glucose, insulin and C-peptide were determined dynamically in recipients and the sites of transplantation were observed morphologically. RESULTS: As compared with the control group without immunosuppressive agents, FK506+MMF and FK506+MMF+Pred could prolong the survival time of grafts significantly. There were many morphologically intact islets in the liver of recipients 2 months after transplantation. Group FK506+MMF kept normal levels of blood glucose, insulin and C-peptide beyond 60 days after transplantation. In contrast, group FK506+MMF+Pred secreted less C-peptide(P<0.05) and maintained a higher level of blood glucose concentration (P<0.01) after the operation. There was no significant difference in insulin concentrations between the two groups. The level of blood glucose beyond the first 2 weeks after drug withdrawal in group FK506+MMF+Pred decreased obviously (P<0.05), and the secretion of insulin and C-peptide increased. These results were compared with those the first 2 weeks after transplantation and the first 2 weeks after drug withdrawal. CONCLUSIONS: Both regimens of FK506+MMF and FK506+MMF+Pred could provide effective immunosup-pression. Moreover the combined glucocorticoid-free immunosuppressive strategy of low-dose FK506 and MMF could protect islet grafts in islet transplantation without diabetogenic side-effects.展开更多
In order to study the correlation between the neuroendocrine and immune systems, we observed the distribution and expression of interferon γ(IFN-γ) in cells of SD rat pancreas islets using the streptavidin-perosidas...In order to study the correlation between the neuroendocrine and immune systems, we observed the distribution and expression of interferon γ(IFN-γ) in cells of SD rat pancreas islets using the streptavidin-perosidase immunohistochemical method. A number of IFN-γ-like positive substances were found in the in the cytoplasm of pancreas islet A cells, but the nucleus could not be stained. Most of the IFN-γ-like positive cells were distributed around the periphery of the pancreas islet, the cells were round or oval in shape and the cell body was relatively large. Results suggest IFN-γ may play a role in the regulation of the function of pancreas islet cells and act as a neuro-immune medium .展开更多
目的探讨运动与中药对糖尿病大鼠胰岛β细胞功能指数(isletβ-cell function index,HOMA-%β)、血糖及氧化应激状态的影响。方法 Wistar雄性大鼠60只,用小剂量链脲佐菌素加高脂饲料的方法建立糖尿病大鼠模型,观察运动、中药丹蛭降糖胶...目的探讨运动与中药对糖尿病大鼠胰岛β细胞功能指数(isletβ-cell function index,HOMA-%β)、血糖及氧化应激状态的影响。方法 Wistar雄性大鼠60只,用小剂量链脲佐菌素加高脂饲料的方法建立糖尿病大鼠模型,观察运动、中药丹蛭降糖胶囊及两者联用对糖尿病大鼠空腹血糖(FBG)、空腹血清胰岛素(FINS)、甘油三酯(TG)、总胆固醇(TC)、胰腺匀浆中的谷胱甘肽过氧化物酶(GSH-Px)、超氧化物歧化酶(SOD)、丙二醛(MDA)的影响,并计算HOMA-%β,用多因素逐步回归分析探讨影响HOMA-%β的主要因素。结果与模型组比较,单纯运动或中药干预后,大鼠FBG、TG、TC、胰腺MDA均明显降低(P<0.05,P<0.01),HOMA-%β明显升高(P<0.01),运动组胰腺GSH-Px活性明显升高(P<0.01);运动与中药联用对FBG、TG、HOMA-%β、胰腺SOD、GSH-Px改变有协同作用(P<0.05)。FBG与胰腺SOD、GSH-Px呈显著负相关且有线性回归关系,HOMA-%β与FBG、TG、TC、胰腺MDA水平负相关,与胰腺SOD、GSH-Px水平正相关,且与FBG有线性回归关系。结论运动及丹蛭降糖胶囊可发挥协同作用,能明显改善糖脂代谢、提高胰腺抗氧化水平,从而减轻胰岛β细胞损伤。展开更多
基金Subject of Jiangsu Province135 Projects (2001 31)
文摘Objective: To evaluate the immunoisola ti ng effects of barium-alginate microencapsulation on islets allograft survival. Methods: The nonmicroencapsulated and microencapsulated islets w ere transplanted under the kidney capsule or intraperitoneally into Wistar rat w ith STZ-induced diabetes. The blood glucose and insulin secretion of grafts wer e observed. Graft function was tested by oral glucose tolerance test (OGTT). Results: ①Five diabetic rats became normoglycemic for 48 to 72 h after microencapsulated islets transplantation. The survival of transplanted i slets was on an average of 6 W. ②The normalization of the glycemia and insulin in the transplanted rats was associated with normal glucose and insulin profiles in response to OGTT. Conclusion: Microencapsulation with barium -alginate membrane can prolong islet survival and protect islets against allore jection.
文摘BACKGROUND: The most common complication after allogenic islet transplantation is rejection. This study was to evaluate the effect of anti-rejection of glucocorticoid-free immunosuppressive regimen on allogenic islet transplantation. METHODS: Tacrolimus(FK506)+mycophenolate mofetil (MMF) and FK506+MMF+prednisone (Pred) were administered respectively for 2 weeks to inhibit rejection after allogenic islet transplantation in rats, which were compared with the control group. The concentrations of blood glucose, insulin and C-peptide were determined dynamically in recipients and the sites of transplantation were observed morphologically. RESULTS: As compared with the control group without immunosuppressive agents, FK506+MMF and FK506+MMF+Pred could prolong the survival time of grafts significantly. There were many morphologically intact islets in the liver of recipients 2 months after transplantation. Group FK506+MMF kept normal levels of blood glucose, insulin and C-peptide beyond 60 days after transplantation. In contrast, group FK506+MMF+Pred secreted less C-peptide(P<0.05) and maintained a higher level of blood glucose concentration (P<0.01) after the operation. There was no significant difference in insulin concentrations between the two groups. The level of blood glucose beyond the first 2 weeks after drug withdrawal in group FK506+MMF+Pred decreased obviously (P<0.05), and the secretion of insulin and C-peptide increased. These results were compared with those the first 2 weeks after transplantation and the first 2 weeks after drug withdrawal. CONCLUSIONS: Both regimens of FK506+MMF and FK506+MMF+Pred could provide effective immunosup-pression. Moreover the combined glucocorticoid-free immunosuppressive strategy of low-dose FK506 and MMF could protect islet grafts in islet transplantation without diabetogenic side-effects.
文摘In order to study the correlation between the neuroendocrine and immune systems, we observed the distribution and expression of interferon γ(IFN-γ) in cells of SD rat pancreas islets using the streptavidin-perosidase immunohistochemical method. A number of IFN-γ-like positive substances were found in the in the cytoplasm of pancreas islet A cells, but the nucleus could not be stained. Most of the IFN-γ-like positive cells were distributed around the periphery of the pancreas islet, the cells were round or oval in shape and the cell body was relatively large. Results suggest IFN-γ may play a role in the regulation of the function of pancreas islet cells and act as a neuro-immune medium .
文摘目的探讨运动与中药对糖尿病大鼠胰岛β细胞功能指数(isletβ-cell function index,HOMA-%β)、血糖及氧化应激状态的影响。方法 Wistar雄性大鼠60只,用小剂量链脲佐菌素加高脂饲料的方法建立糖尿病大鼠模型,观察运动、中药丹蛭降糖胶囊及两者联用对糖尿病大鼠空腹血糖(FBG)、空腹血清胰岛素(FINS)、甘油三酯(TG)、总胆固醇(TC)、胰腺匀浆中的谷胱甘肽过氧化物酶(GSH-Px)、超氧化物歧化酶(SOD)、丙二醛(MDA)的影响,并计算HOMA-%β,用多因素逐步回归分析探讨影响HOMA-%β的主要因素。结果与模型组比较,单纯运动或中药干预后,大鼠FBG、TG、TC、胰腺MDA均明显降低(P<0.05,P<0.01),HOMA-%β明显升高(P<0.01),运动组胰腺GSH-Px活性明显升高(P<0.01);运动与中药联用对FBG、TG、HOMA-%β、胰腺SOD、GSH-Px改变有协同作用(P<0.05)。FBG与胰腺SOD、GSH-Px呈显著负相关且有线性回归关系,HOMA-%β与FBG、TG、TC、胰腺MDA水平负相关,与胰腺SOD、GSH-Px水平正相关,且与FBG有线性回归关系。结论运动及丹蛭降糖胶囊可发挥协同作用,能明显改善糖脂代谢、提高胰腺抗氧化水平,从而减轻胰岛β细胞损伤。
